I forgot to say that there is another possibility in an atmosphère composition wich was completely different. Maybe some other kind of molecules wich support life were be present and stable, and it is after that all the organic molecule that we know appeared.

MrMistery wrote:a human cell that old? where did they find it? and how did they decide it was human and how did they decide it was that old? Tell your professor to give a reference or people will probably think he is insane

I don't think it's the human cell because human cell is the type of cell that can live if supported by the tissue which surrounding it...while cell's ancestor is believed kinda live solitary (I mean without tissue support..)

@Pitch
ancient atmosphere is different from now because at that time, there's not much oxydator like Oxygen..

Q: Why are chemists great for solving problems?
A: They have all the solutions.